snps_dw_mmc.c
4.45 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
// SPDX-License-Identifier: GPL-2.0+
/*
* Synopsys DesignWare Multimedia Card Interface driver
* extensions used in various Synopsys ARC devboards.
*
* Copyright (C) 2019 Synopsys
* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <dwmmc.h>
#include <errno.h>
#include <fdtdec.h>
#include <dm/device_compat.h>
#include <linux/libfdt.h>
#include <linux/err.h>
#include <malloc.h>
#define CLOCK_MIN 400000 /* 400 kHz */
#define FIFO_MIN 8
#define FIFO_MAX 4096
struct snps_dwmci_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct snps_dwmci_priv_data {
struct dwmci_host host;
u32 f_max;
};
static int snps_dwmmc_clk_setup(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
struct clk clk_ciu, clk_biu;
int ret;
ret = clk_get_by_name(dev, "ciu", &clk_ciu);
if (ret)
goto clk_err;
ret = clk_enable(&clk_ciu);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
goto clk_err_ciu;
host->bus_hz = clk_get_rate(&clk_ciu);
if (host->bus_hz < CLOCK_MIN) {
ret = -EINVAL;
goto clk_err_ciu_dis;
}
ret = clk_get_by_name(dev, "biu", &clk_biu);
if (ret)
goto clk_err_ciu_dis;
ret = clk_enable(&clk_biu);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
goto clk_err_biu;
return 0;
clk_err_biu:
clk_free(&clk_biu);
clk_err_ciu_dis:
clk_disable(&clk_ciu);
clk_err_ciu:
clk_free(&clk_ciu);
clk_err:
dev_err(dev, "failed to setup clocks, ret %d\n", ret);
return ret;
}
static int snps_dwmmc_ofdata_to_platdata(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
u32 fifo_depth;
int ret;
host->ioaddr = devfdt_get_addr_ptr(dev);
/*
* If fifo-depth is unset don't set fifoth_val - we will try to
* auto detect it.
*/
ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
if (!ret) {
if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
return -EINVAL;
host->fifoth_val = MSIZE(0x2) |
RX_WMARK(fifo_depth / 2 - 1) |
TX_WMARK(fifo_depth / 2);
}
host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
return -EINVAL;
/*
* If max-frequency is unset don't set priv->f_max - we will use
* host->bus_hz in probe() instead.
*/
ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
if (!ret && priv->f_max < CLOCK_MIN)
return -EINVAL;
host->fifo_mode = dev_read_bool(dev, "fifo-mode");
host->name = dev->name;
host->dev_index = 0;
host->priv = priv;
return 0;
}
int snps_dwmmc_getcd(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
}
struct dm_mmc_ops snps_dwmci_dm_ops;
static int snps_dwmmc_probe(struct udevice *dev)
{
#ifdef CONFIG_BLK
struct snps_dwmci_plat *plat = dev_get_platdata(dev);
#endif
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
unsigned int clock_max;
int ret;
/* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
ret = snps_dwmmc_clk_setup(dev);
if (ret)
return ret;
if (!priv->f_max)
clock_max = host->bus_hz;
else
clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
#ifdef CONFIG_BLK
dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
host->mmc = &plat->mmc;
#else
ret = add_dwmci(host, clock_max, CLOCK_MIN);
if (ret)
return ret;
#endif
host->mmc->priv = &priv->host;
upriv->mmc = host->mmc;
host->mmc->dev = dev;
return dwmci_probe(dev);
}
static int snps_dwmmc_bind(struct udevice *dev)
{
#ifdef CONFIG_BLK
struct snps_dwmci_plat *plat = dev_get_platdata(dev);
int ret;
ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
if (ret)
return ret;
#endif
return 0;
}
static const struct udevice_id snps_dwmmc_ids[] = {
{ .compatible = "snps,dw-mshc" },
{ }
};
U_BOOT_DRIVER(snps_dwmmc_drv) = {
.name = "snps_dw_mmc",
.id = UCLASS_MMC,
.of_match = snps_dwmmc_ids,
.ofdata_to_platdata = snps_dwmmc_ofdata_to_platdata,
.ops = &snps_dwmci_dm_ops,
.bind = snps_dwmmc_bind,
.probe = snps_dwmmc_probe,
.priv_auto_alloc_size = sizeof(struct snps_dwmci_priv_data),
.platdata_auto_alloc_size = sizeof(struct snps_dwmci_plat),
};